diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 2423aae498..12c5d40e09 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1069,11 +1069,13 @@ SDOperand DAGCombiner::SimplifyBinOpWithSameOpcodeHands(SDNode *N) { return DAG.getNode(ISD::TRUNCATE, VT, ORNode); } - // fold (and (shl/srl/sra x), (shl/srl/sra y)) -> (shl/srl/sra (and x, y)) - // fold (or (shl/srl/sra x), (shl/srl/sra y)) -> (shl/srl/sra (or x, y)) - // fold (xor (shl/srl/sra x), (shl/srl/sra y)) -> (shl/srl/sra (xor x, y)) + + // For each of OP in SHL/SRL/SRA/AND... + // fold (and (OP x, z), (OP y, z)) -> (OP (and x, y), z) + // fold (or (OP x, z), (OP y, z)) -> (OP (or x, y), z) + // fold (xor (OP x, z), (OP y, z)) -> (OP (xor x, y), z) if ((N0.getOpcode() == ISD::SHL || N0.getOpcode() == ISD::SRL || - N0.getOpcode() == ISD::SRA) && + N0.getOpcode() == ISD::SRA || N0.getOpcode() == ISD::AND) && N0.getOperand(1) == N1.getOperand(1)) { SDOperand ORNode = DAG.getNode(N->getOpcode(), N0.getOperand(0).getValueType(), |